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run code in 200+ php & hhvm versions
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<?php $text = "test/test2"; echo preg_match('\w+\\/\w+',$text);
based on UVHUA
Output for 4.3.11 - 7.2.0
Warning: preg_match(): Delimiter must not be alphanumeric or backslash in /in/AuKBM on line 3
Output for 4.3.0 - 4.3.10
Warning: Delimiter must not be alphanumeric or backslash in /in/AuKBM on line 3